Isomeric and ground-state decay of ~(215)Bi

摘要

A new high-spin isomer in ~(215)Bi, with a half-life of 36.9(6) s, has been identified at the PSB-ISOLDE on-line mass separator using the pulsed-release technique combined with the element selective RILIS source. A decay scheme of ~(215)Bi was constructed and complemented with the low-spin structure observed in ~(215)Bi decay. The population of a cascade on top of the (vg9/2)~5_(9/2+) level in ~(215)Po provides evidence for Gamow-Teller β-decay of the high-spin ~(215)Bi isomer.